PhantomJS not found. You can install it with webshot::install_phantomjs(). If it is installed, please make sure the phantomjs executable can be found via the PATH variable.
Warning in normalizePath(f2) :
path[1]="./webshot115e1055786b.png": No such file or directory
Warning in file(con, "rb") :
cannot open file './webshot115e1055786b.png': No such file or directory
Quitting from lines 208-219 (introducing-stplanr.Rmd)
Error: processing vignette 'introducing-stplanr.Rmd' failed with diagnostics:
cannot open the connection
Execution halted